kubernetes-the-hard-way/docs/02-client-tools.md

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# Installing the Client Tools
In this lab you will install the command line utilities required to complete this tutorial: [cfssl](https://github.com/cloudflare/cfssl), [cfssljson](https://github.com/cloudflare/cfssl), and [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl).
## Install CFSSL
The `cfssl` and `cfssljson` command line utilities will be used to provision a [PKI Infrastructure](https://en.wikipedia.org/wiki/Public_key_infrastructure) and generate TLS certificates.
Download `cfssl` and `cfssljson`: from https://github.com/cloudflare/cfssl/releases
Rename the files to cfssl & cfssljson
Install `cfssl` and `cfssljson`
### OS X
```
chmod +x cfssl cfssljson
```
```
sudo mv cfssl cfssljson /usr/local/bin/
```
Some OS X users may experience problems using the pre-built binaries in which case [Homebrew](https://brew.sh) might be a better option:
```
brew install cfssl
```
### Linux
```
chmod +x cfssl cfssljson
```
```
sudo mv cfssl cfssljson /usr/local/bin/
```
### Verification
Verify `cfssl` and `cfssljson` version 1.4.1 or higher is installed:
```
cfssl version
```
> output
```
Version: 1.4.1
Runtime: go1.12.12
```
```
cfssljson --version
```
```
Version: 1.4.1
Runtime: go1.12.12
```
## Install kubectl
The `kubectl` command line utility is used to interact with the Kubernetes API Server. Download and install `kubectl` from the official release binaries:
### OS X
```
curl -o kubectl https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/darwin/amd64/kubectl
```
```
chmod +x kubectl
```
```
sudo mv kubectl /usr/local/bin/
```
### Linux
```
wget https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kubectl
```
```
chmod +x kubectl
```
```
sudo mv kubectl /usr/local/bin/
```
### Verification
Verify `kubectl` version 1.21.0 or higher is installed:
```
kubectl version --client
```
> output
```
Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.0", GitCommit:"cb303e613a121a29364f75cc67d3d580833a7479", GitTreeState:"clean", BuildDate:"2021-04-08T16:31:21Z", GoVersion:"go1.16.1", Compiler:"gc", Platform:"linux/amd64"}
```
Next: [Provisioning Compute Resources](03-compute-resources.md)